postgersql field names, table names, naming capitalization issue (original)

In postgresql, the field name or table name in capital letters if, when, for example, Table_Name, such a name written in the query

SELECT * FROM "Table_Name" This name must be added to the table  . ""  If it is all lowercase, then there is no need, for example, table_name

SELECT * FROM Table_Name times the SQL statement has uppercase letters in the last name field will be translated into lower case.